package api;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import domain.User;
import exception.LogException;
import service.UserService;
import utils.GetRequestJsonUtils;
import utils.Response;
import utils.ResponseCode;

import javax.servlet.ServletException;
import javax.servlet.http.*;
import java.io.IOException;

public class loginServlet  extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //第一步：提取参数

        JSONObject object= GetRequestJsonUtils.getRequestJsonObject(req);
        String user_str= object.getString("user");
    //第二步：转换参数成user对象；
       User user= JSON.parseObject(user_str,User.class);
    //第三步：去查询数据库中是否有这个记录
        UserService userService=new UserService();
        Response build=null;
        try {
            userService.login(user);//登陆成功，返回数据
            //创建一个sessioin,该Session对象是这个请求对应浏览器独有
            HttpSession session= req.getSession();
            session.setAttribute("user",user);
            Cookie cookie=new Cookie("JSESSIOND",session.getId());
            resp.addCookie(cookie);

             build= Response.build(ResponseCode.SUCCESS);
        }catch (LogException e){
            e.printStackTrace();//登录异常，返回成功消息
            build= Response.build(e.getError());
        }
    //第四部：判断为空，生成登录失败的消息对象
    //第五步：把消息对象转换层字符串，返回浏览器
        resp.setContentType("application/json;charset=utf-8");
        resp.getWriter().write(JSON.toJSON(build).toString());

    }
}
